Q51. A 2-day-old term infant developments clinical jaundice. On physical examination, the jaundice is visible down to the chest. Laboratory testing shows a total serum bilirubin of 8 mg/dL, with the conjugated fraction being 0.4 mg/dL. The infant is feeding well and has normal newborn reflexes. What is the most likely type of jaundice?
A) Biliary Atresia
B) Neonatal Hepatitis
C) Physiological Jaundice of the Newborn
D) Hemolytic Disease of the Newborn (Rh incompatibility)
Correct Answer: C
Explanation: Mild, unconjugated hyperbilirubinemia appearing after the first 24 hours of life in an otherwise healthy infant is consistent with physiological jaundice, which arises from neonatal hepatic immaturity and increased RBC turnover.
Q52. A 3-year-old girl is brought to the emergency outpatient ward because of a generalized tonic-clonic seizure that lasted for 3 minutes. She has a 1-day history of high-grade fever (temperature 39.4°C), dry cough, and runny nose. On examination, she is fully conscious, alert, and has no signs of meningeal irritation or focal neurological deficits. What is the most likely diagnosis?
A) Acute Bacterial Meningitis
B) Viral Encephalitis
C) Simple Febrile Seizure
D) Epilepsy
Correct Answer: C
Explanation: A brief (<15 minutes), generalized seizure occurring once within 24 hours in a child aged 6 months to 5 years during a febrile illness, without central nervous system infection or prior non-febrile seizures, is a simple febrile seizure. Q53. A 6-month-old infant is brought to the clinic for a routine growth and immunization assessment. On examination, the infant can sit with support, transfer objects from one hand to another, and babbles. However, the infant cannot crawl or stand. How should this child's developmental status be classified? A) Severe global developmental delay B) Delayed motor development only C) Normal developmental milestones for age D) Delayed language development only Correct Answer: C Explanation: Sitting with support, transferring objects, and babbling are classic milestones achieved by 6 months of age. Crawling and standing occur later in infancy. Q54. A 12-month-old infant is brought to the health center due to a 3-day history of productive cough and fast breathing. On examination, the child is conscious, alert, and has a respiratory rate of 52 breaths per minute. There are subcostal chest indrawings but no stridor or general danger signs. According to IMNCI guidelines, how should this child be treated? A) Give oral Amoxicillin for 5 days at home and counsel the mother B) Admit immediately for intravenous Ceftriaxone and oxygen therapy C) Prescribe oral salbutamol syrup and review in 2 days D) Give home remedies for cough and cold without antibiotics Correct Answer: A Explanation: Under IMNCI criteria, a child aged 2–11 months with a respiratory rate ≥50 breaths/minute or chest indrawing without general danger signs is classified as having Pneumonia and can be treated at home with oral Amoxicillin. Q55. A 7-year-old boy presents with a 1-week history of dark, tea-colored urine, periorbital puffiness, and decreased urine output. He had a severe skin infection (impetigo) on his legs 2 weeks ago. On physical examination, his blood pressure is elevated at 130/85 mmHg. Urinalysis shows dysmorphic red blood cells and red blood cell casts. What is the underlying diagnostic entity? A) Minimal Change Disease B) Post-Streptococcal Glomerulonephritis (PSGN) C) Acute Pyelonephritis D) IgA Nephropathy Correct Answer: B Explanation: PSGN is a classic post-infectious immune-complex mediated glomerulonephritis (Type III hypersensitivity) that presents with the nephritic triad (hematuria/tea-colored urine, hypertension, and edema) following a streptococcal skin or pharyngeal infection. Q56. A 5-year-old boy who has been admitted for severe acute malnutrition (marasmus) is undergoing stabilization therapy under Plan F-75. On the third day of admission, he develops severe muscle weakness, abdominal distension due to paralytic ileus, and weak heart sounds. An ECG reveals flattened T waves and the appearance of U waves. Which electrolyte deficiency is responsible for this condition? A) Hyperkalemia B) Hypokalemia C) Hyponatremia D) Hypocalcemia Correct Answer: B Explanation: During the nutritional rehabilitation of children with severe acute malnutrition, introduction of feeds can cause intracellular shifts of potassium, magnesium, and phosphate (Refeeding Syndrome), resulting in severe hypokalemia characterized by muscle weakness and characteristic ECG modifications. Q57. A 2-year-old child is brought to the pediatric outpatient department with a history of progressive pallor, poor feeding, and lethargy. The child is exclusively breastfed and consumes regular family meals without meat or iron-fortified cereals. A complete blood count reveals a hemoglobin level of 6.5 g/dL, a low mean corpuscular volume (MCV = 62 fL), and a high red cell distribution width (RDW). What is the first-line treatment? A) Immediate packed red blood cell transfusion B) Oral Iron supplementation therapy C) Intramuscular Vitamin B12 injections D) Oral Folic acid supplements Correct Answer: B Explanation: The clinical history and microcytic, hypochromic anemia index support a diagnosis of nutritional iron deficiency anemia, which is managed with oral iron supplements and dietary modifications. Q58. A 4-year-old girl is brought with an acute onset of severe watery diarrhea and persistent vomiting for 24 hours. On physical examination, she is irritable, thirsty, has slightly sunken eyes, and the skin pinch on her abdomen returns slowly (takes less than 2 seconds). According to IMNCI guidelines, what is her hydration classification and standard plan? A) No Dehydration; Plan A B) Some Dehydration; Plan B (Oral rehydration salts in the clinic) C) Severe Dehydration; Plan C (Urgent IV fluids) D) Persistent Diarrhea; Plan B Correct Answer: B Explanation: A child presenting with two signs among irritability, sunken eyes, and a slow skin pinch (<2 seconds) is classified as having Some Dehydration under IMNCI, indicating treatment with ORS in the clinic over 4 hours (Plan B). Q59. A 3-year-old boy is brought to the emergency center with a history of fever and generalized skin rashes for 5 days. On examination, he has bilateral non-purulent conjunctivitis, cracked red lips, a "strawberry tongue," and hard edema of his hands and feet. What is the primary diagnosis? A) Measles B) Scarlet Fever C) Kawasaki Disease D) Autoimmune Thrombocytopenic Purpura Correct Answer: C Explanation: Kawasaki disease is an acute systemic vasculitis of childhood characterized by prolonged fever and criteria including conjunctivitis, oral mucosal changes (strawberry tongue), polymorphous rash, and extremity updates (edema/erythema). Q60. An 18-month-old child is brought to the clinic because of a failure to attain independent walking. On examination, the child has a large head with frontal bossing, widening of both wrists, and a noticeable bowing of the lower legs. What is the most likely diagnosis? A) Achondroplasia B) Osteogenesis Imperfecta C) Nutritional Vitamin D Deficiency Rickets D) Congenital Hip Dysplasia Correct Answer: C Explanation: Frontal bossing, widening of the epiphyses (wrists), and bowing of weight-bearing long bones are classic skeletal manifestations of active nutritional rickets caused by Vitamin D deficiency. 4. Obstetrics & Gynecology Q61. A 24-year-old G1P0 woman at 38 weeks of gestation presents to the emergency department with a severe headache and blurry vision. Her blood pressure is 160/110 mmHg on two readings 4 hours apart, and a dipstick urinalysis shows 3+ proteinuria. While being evaluated, she develops a generalized tonic-clonic seizure. What is the immediate drug of choice to manage this patient's seizures? A) Diazepam B) Magnesium sulfate C) Phenytoin D) Phenobarbital Correct Answer: B Explanation: Magnesium sulfate is the definitive drug of choice for the prevention and treatment of eclamptic seizures, outperforming traditional anticonvulsants like diazepam and phenytoin. Q62. A 28-year-old primigravida at 39 weeks of gestation has been in active labor for 12 hours. Her cervical dilation has remained stationary at 6 cm for the last 4 hours despite strong, regular uterine contractions (4 contractions in 10 minutes, each lasting 45 seconds). The fetal heart rate is reassuring. What is the most appropriate next step in management? A) Augmentation with Oxytocin infusion B) Perform an immediate Cesarean Section C) Administer maternal sedation and re-evaluate in 2 hours D) Perform instrumental delivery using vacuum extraction Correct Answer: B Explanation: This patient is experiencing active phase arrest of labor with adequate uterine contractions, which points to cephalopelviproportion (CPD) or malposition. Oxytocin is not indicated if contractions are already adequate; a Cesarean section is required. Q63. A 30-year-old pregnant woman (G2P1) at 32 weeks of gestation presents with sudden-onset, painless, bright red vaginal bleeding. She denies any trauma or abdominal pain. Her abdomen is soft and non-tender, and the fetal heart rate is normal. What is the most likely diagnosis? A) Abruptio Placentae B) Placenta Previa C) Uterine Rupture D) Vasa Previa Correct Answer: B Explanation: Painless, bright red third-trimester vaginal bleeding in the presence of a soft, non-tender uterus is the classic clinical presentation of placenta previa. Abruptio placentae, by contrast, is characteristically painful. Q64. A 23-year-old healthy woman presents for a routine prenatal checkup at 12 weeks of gestation. She asks about nutritional interventions to prevent neural tube defects (NTDs) in her baby. At what period is folic acid supplementation most effective in preventing these defects? A) From the second trimester until delivery B) Pre-conceptionally up to the first 12 weeks of gestation C) Only during the active phase of labor D) Exclusively during the third trimester Correct Answer: B Explanation: The neural tube closes within the first 28 days following conception, often before a woman realizes she is pregnant. Therefore, folic acid must be taken pre-conceptionally and through the first trimester to significantly reduce the risk of structural NTDs. Q65. A 26-year-old G3P2 woman at 34 weeks of gestation presents with regular uterine contractions. On sterile speculum examination, fluid is seen pooling in the posterior vaginal fornix, which turns nitrazine paper blue. Ferning is visible under microscopy. There are no signs of infection or fetal distress. What is the most appropriate management strategy? A) Immediate induction of labor with high-dose oxytocin B) Administer prophylactic antibiotics, antenatal corticosteroids, and monitor closely for infection C) Perform an immediate emergency Cesarean delivery D) Discharge the patient home and advise bed rest until 40 weeks Correct Answer: B Explanation: For patients with preterm premature rupture of membranes (PPROM) between 24 and 34 weeks without evidence of chorioamnionitis or fetal distress, conservative expectant management is recommended. This includes administering corticosteroids for lung maturity and prophylactic antibiotics to prolong latency and reduce maternal-fetal infectious morbidity. Q66. A 29-year-old primigravida at 36 weeks of gestation presents with generalized pruritus that is most severe on the palms of her hands and soles of her feet, particularly at night. She has no visible skin rash or history of allergies. Laboratory evaluation reveals significantly elevated serum total bile acids and mild elevations in transaminases. What is the most appropriate management plan? A) Initiate Ursodeoxycholic Acid (UDCA) and schedule delivery at 37 weeks of gestation B) Reassure the patient that it is a normal pregnancy change and review in 4 weeks C) Perform an immediate emergency Cesarean Section at presentation D) Prescribe high-dose oral Prednisone and continue pregnancy to full term Correct Answer: A Explanation: Intrahepatic cholestasis of pregnancy carries a high risk of sudden intrauterine fetal death, requiring symptomatic relief with UDCA and timed delivery by 37 weeks. Q67. A 31-year-old multigravida woman at 38 weeks of gestation is in active labor. Following the delivery of a healthy 4.2 kg infant, there is sudden, profuse vaginal bleeding. On abdominal palpation, the uterus is noted to be soft, boggy, and enlarged, reaching above the umbilicus. What is the most immediate and appropriate initial step in managing this condition? A) Perform a continuous bimanual uterine massage and administer intravenous Oxytocin B) Prepare the patient for an emergency hysterectomy C) Pack the uterine cavity with sterile gauze D) Administer high-dose intravenous Heparin Correct Answer: A Explanation: Uterine atony is the most common cause of postpartum hemorrhage; immediate bimanual massage and uterotonic administration stimulate contractions to compress bleeding vessels. Q68. A 38-year-old G4P3 woman at 39 weeks of gestation presents in active labor. She has a history of two previous deliveries via lower-segment Cesarean section. During a strong uterine contraction, she experiences a sudden, tearing abdominal pain, followed by a complete cessation of labor contractions. On exam, her blood pressure drops to 70/40 mmHg, and fetal heart tones are lost. The fetal presenting part is no longer palpable in the pelvis. What is the immediate definitive management? A) Administer high-dose Oxytocin to restart labor contractions B) Perform an immediate laparotomy for delivery and uterine repair or hysterectomy C) Attempt instrumental delivery using a vacuum extractor D) Apply fundal pressure to assist in completing the second stage of labor Correct Answer: B Explanation: A sudden cessation of labor with loss of fetal station and maternal shock indicates a complete uterine rupture, requiring immediate surgical laparotomy. Q69. A 28-year-old woman at 10 weeks of gestation presents to the clinic for her first antenatal care visit. She tests positive for HIV during routine screening. She has never received antiretroviral therapy (ART) and is clinically asymptomatic. What is the correct management strategy according to guidelines for preventing mother-to-child transmission (PMTCT)? A) Initiate standard combination Antiretroviral Therapy (ART) immediately and continue it for life B) Delay ART initiation until the third trimester to minimize fetal organogenesis risks C) Administer single-dose Nevirapine only at the onset of active labor D) Withhold ART unless her CD4 cell count drops below 350 cells/µL Correct Answer: A Explanation: Current guidelines recommend a 'Option B+' strategy where all pregnant women living with HIV initiate lifelong combination ART immediately, regardless of CD4 count or clinical stage. Q70. A 25-year-old G1P0 woman at 38 weeks of gestation is admitted in active labor. After 12 hours of progressive labor, she delivers the fetal head, but the head suddenly retracts tightly against the maternal perineum ("turtle sign"). Gentle downward traction on the fetal head fails to deliver the anterior shoulder. What is the most appropriate immediate next mechanical maneuver to perform? A) Apply strong fundal pressure to force the baby downward B) Perform the McRoberts maneuver (hyperflexion of maternal thighs against the abdomen) and apply suprapubic pressure C) Apply rotational traction on the fetal neck D) Prepare for an emergency Cesarean Section without moving the fetus Correct Answer: B Explanation: The clinical scenario describes shoulder dystocia. The initial steps involve the McRoberts maneuver paired with suprapubic pressure to dislodge the impacted anterior shoulder from behind the maternal pubic symphysis. Fundal pressure is strictly contraindicated. Q71. A 26-year-old female presents to the outpatient clinic with a history of severe lower abdominal pain, high fever, and a foul-smelling vaginal discharge for 3 days. She had an unsafe induced abortion performed at a local pharmacy 5 days ago. On physical examination, her temperature is 39.2°C, and there is marked lower abdominal rebound tenderness. Pelvic exam reveals an open cervical os with purulent discharge and extreme uterine tenderness. What is the primary diagnosis? A) Threatened Abortion B) Ectopic Pregnancy C) Septic Abortion D) Pelvic Inflammatory Disease Correct Answer: C Explanation: A uterine infection following an induced or spontaneous abortion defines a septic abortion, which requires urgent broad-spectrum antibiotics and evacuation of any retained products of conception. Q72. A 22-year-old female presents to the emergency room with a 2-hour history of sudden, severe, sharp left-sided lower abdominal pain, accompanied by light vaginal bleeding and a brief fainting spell. Her last menstrual period was 7 weeks ago. On examination, her blood pressure is 90/60 mmHg, pulse is 112 bpm, and there is marked cervical motion tenderness. What is the most critical diagnostic entity to consider? A) Acute Appendicitis B) Ruptured Ectopic Pregnancy C) Torsion of an Ovarian Cyst D) Incomplete Abortion Correct Answer: B Explanation: In a woman of reproductive age presenting with amenorrhea, acute lower abdominal pain, vaginal bleeding, and hemodynamic instability, a ruptured ectopic pregnancy must be suspected and managed immediately. Q73. A 48-year-old female presents to the gynecology outpatient clinic with a history of heavy, prolonged menstrual bleeding (menorrhagia) and pelvic pressure for the past 6 months. On pelvic examination, the uterus is found to be symmetrically enlarged, firm, non-tender, and matches the size of a 14-week pregnant uterus. A pregnancy test is negative. What is the most likely diagnosis? A) Endometrial Carcinoma B) Uterine Leiomyoma (Fibroids) C) Adenomyosis D) Cervical Carcinoma Correct Answer: B Explanation: Uterine leiomyomas (fibroids) are benign smooth muscle tumors of the uterus that characteristically present with menorrhagia and an asymmetrical or symmetrical enlarged, firm, non-tender uterus. Q74. A 32-year-old G3P2 woman at 39 weeks of gestation is in the second stage of labor. Following 2 hours of active pushing, the fetal head remains at station +1, and the maternal pelvis is clinically adequate. The fetal heart rate tracing demonstrates repetitive late decelerations. What is the most appropriate management? A) Allow the patient to push for another hour to complete natural descent B) Perform an operative delivery using an instrumental vacuum extractor or forceps C) Administer maternal sedation to rest the uterus D) Initiate an emergency laparotomy for a classic Cesarean section Correct Answer: B Explanation: Prolonged second stage of labor accompanied by a non-reassuring fetal heart rate pattern (fetal distress) when the head is low (+1 station or below) is an absolute indication for operative vaginal delivery to expedite birth. Q75. A 23-year-old primigravida at 14 weeks of gestation comes to the antenatal clinic for her routine screening. Her blood group is determined to be O-Negative, and her husband's blood group is A-Positive. She has no history of blood transfusions or miscarriages. What is the standard recommendation regarding the administration of Rho(D) immune globulin (RhoGAM)? A) Administer RhoGAM immediately at 14 weeks of gestation B) Administer RhoGAM at 28 weeks of gestation and again within 72 hours of delivery if the infant is Rh-positive C) RhoGAM is not necessary since this is her first pregnancy D) Administer RhoGAM only if she develops signs of preeclampsia Correct Answer: B Explanation: To prevent Rh isoimmunization in an unsensitized Rh-negative mother carrying an Rh-positive fetus, prophylactic Rho(D) immune globulin is administered at 28 weeks of gestation and a backup dose postpartum within 72 hours of delivering an Rh-positive infant. Q76. A 52-year-old postmenopausal woman presents with a 2-month history of intermittent, painless vaginal bleeding. She reached menopause 3 years ago and has no prior history of abnormal cervical screening. She is obese and has chronic hypertension. What is the primary diagnostic step to rule out malignancy? A) Transvaginal ultrasound alone B) Endometrial Biopsy or Fractional Curettage C) Pap smear screening D) Empirical treatment with oral progesterone for 3 months Correct Answer: B Explanation: Postmenopausal bleeding is highly suspicious for endometrial carcinoma. A definitive tissue evaluation via endometrial biopsy or fractional curettage is mandatory to rule out hyperplasia or malignancy. Q77. A 25-year-old female presents to the family planning clinic requesting a long-acting reversible contraceptive (LARC). She has a history of heavy, painful menstrual periods but is otherwise healthy. Which of the following options would be most beneficial for both contraception and reducing her menstrual symptoms? A) Copper Intrauterine Device (Cu-IUD) B) Levonorgestrel-releasing Intrauterine System (LNG-IUS) C) Combined Oral Contraceptive Pill (COCP) D) Barrier Male Condoms Correct Answer: B Explanation: The LNG-IUS provides highly effective long-acting contraception and significantly reduces menstrual blood loss and dysmenorrhea due to localized progestin-mediated endometrial suppression, unlike the copper IUD, which can increase bleeding. Q78. A 29-year-old G2P1 woman at 35 weeks of gestation presents to the triage unit with a 4-hour history of regular, painful uterine contractions. On digital examination, her cervix is 4 cm dilated and 80% effaced. The membranes are intact. What is the most important medical intervention to reduce neonatal morbidity prior to delivery? A) Administer intravenous Oxytocin to accelerate delivery B) Administer intramuscular Dexamethasone or Betamethasone C) Perform an immediate amniotomy to check for meconium D) Prescribe high-dose oral tocolytics to delay delivery until 40 weeks Correct Answer: B Explanation: In women experiencing preterm labor prior to 37 weeks of gestation, administration of antenatal corticosteroids (Betamethasone/Dexamethasone) is vital to promote fetal lung maturation and reduce the incidence of respiratory distress syndrome (RDS). Q79. A 34-year-old female presents with a 6-month history of severe dysmenorrhea, deep dyspareunia, and cyclic pelvic pain that worsens just prior to menstruation. She has been trying to conceive for 2 years without success. On pelvic examination, there is generalized tenderness and nodules felt over the uterosacral ligaments. What is the most likely diagnosis? A) Chronic Pelvic Inflammatory Disease B) Endometriosis C) Adenomyosis D) Polycystic Ovary Syndrome (PCOS) Correct Answer: B Explanation: The classic triad of dysmenorrhea, dyspareunia, and infertility, combined with nodularity along the uterosacral ligaments, strongly points toward endometriosis (ectopic endometrial tissue). Q80. A 26-year-old female at 38 weeks of gestation is in active labor. Following a normal progression, she delivers a healthy 3.2 kg infant. The placenta is delivered spontaneously 10 minutes later. Upon inspection of the placenta, you note that a peripheral cotyledon appears to be missing. The maternal vaginal bleeding is heavy. What is the immediate next step in management? A) Administer an additional dose of Oxytocin and observe for 30 minutes B) Manual exploration of the uterine cavity to remove retained placental fragments C) Prepare the patient for an immediate emergency laparotomy D) Pack the vagina tightly with sterile packing gauze Correct Answer: B Explanation: Retained products of conception (placenta fragments) prevent proper uterine contraction, leading to postpartum hemorrhage. Immediate manual exploration and extraction under aseptic conditions are required. 5. Public Health, Epidemiology & Infectious Disease Prevention Q81. During a community health assessment in a low-income sub-city, a medical student finds that the infant mortality rate is high. Which of the following components is included in the numerator when calculating the Infant Mortality Rate (IMR)? A) Number of deaths among children under 5 years of age in a given year B) Number of deaths among infants under 1 year of age in a given year C) Number of fetal deaths after 28 weeks of gestation D) Number of neonatal deaths within the first 28 days of life Correct Answer: B Explanation: The Infant Mortality Rate is calculated as the number of deaths of live-born children under 1 year of age in a given year, divided by the total number of live births in that same year, multiplied by 1,000. Q82. As a medical officer leading a primary healthcare team, you are organizing a mass immunization campaign against Measles in your catchment area. Which level of disease prevention does this mass vaccination campaign represent? A) Primordial Prevention B) Primary Prevention C) Secondary Prevention D) Tertiary Prevention Correct Answer: B Explanation: Primary prevention aims to intercept the development of disease entirely by optimizing baseline immunity or removing pathogenic threats before an initial infection occurs. Immunization campaigns are classic examples. Q83. In a rural district, a medical officer notices a seasonal increase in the number of cases of severe watery diarrhea with rapid, life-threatening dehydration across all age groups. Stool samples confirm Vibrio cholerae. What is the fundamental primary intervention to control and prevent the spread of this epidemic in the community? A) Providing mass prophylactic oral Ciprofloxacin to all healthy residents B) Ensuring universal access to safe, chlorinated drinking water and proper sewage sanitation C) Establishing specialized cholera treatment centers with abundant intravenous fluids D) Imposing a strict quarantine on all affected households Correct Answer: B Explanation: Cholera is a waterborne disease transmitted via the fecal-oral route. Providing safe water, sanitation, and hygiene (WASH) interventions is the definitive primary preventive measure to break environmental transmission. Q84. A 23-year-old medical student is preparing a research proposal to estimate the total number of existing cases of major depressive disorder within a specific university population at a single point in time. Which epidemiological measure of disease frequency is the student evaluating? A) Incidence Rate B) Point Prevalence C) Cumulative Incidence D) Attack Rate Correct Answer: B Explanation: Point prevalence measures the proportion of a population that has a specific disease or condition at a single, defined point in time, capturing both new and pre-existing cases. Q85. As a public health medical officer organizing a regional maternal health program, you analyze data regarding the primary direct causes of maternal mortality in developing nations. Which of the following conditions consistently represents the leading direct cause of maternal death worldwide? A) Unsafe Abortion B) Preeclampsia and Eclampsia C) Severe Postpartum Hemorrhage D) Puerperal Sepsis Correct Answer: C Explanation: While hypertensive disorders, sepsis, and unsafe abortions are significant factors, severe obstetric hemorrhage—particularly postpartum hemorrhage—is globally recognized as the leading direct cause of maternal mortality. Q86. A research team conducts a study comparing a group of patients diagnosed with lung carcinoma to a group of healthy individuals matched by age and sex. The researchers look backward in time to evaluate and compare their histories of exposure to tobacco smoke. What type of study design is this? A) Cohort Study B) Case-Control Study C) Randomized Controlled Trial (RCT) D) Cross-Sectional Study Correct Answer: B Explanation: A case-control study identifies individuals based on their disease outcome status (cases vs. controls) and retrospectively assesses prior exposure histories to compute an Odds Ratio. Q87. A newly introduced diagnostic screening test for a specific infectious disease is evaluated in a population of 1,000 individuals. The test successfully identifies 90 out of 100 individuals who truly have the disease. What epidemiological parameter of a diagnostic test does this value represent? A) Specificity B) Sensitivity C) Positive Predictive Value D) Negative Predictive Value Correct Answer: B Explanation: Sensitivity is the probability that a diagnostic test will correctly identify a true-positive case among individuals who actually possess the target condition. Q88. An outbreak of acute gastrointestinal illness occurs among individuals who attended a community wedding dinner. Out of 150 people who consumed a specific chicken dish, 120 developed diarrhea and abdominal pain within 12 hours. What is the attack rate among those who ate the chicken dish? A) 50% B) 80% C) 20% D) 95% Correct Answer: B Explanation: The attack rate is computed as the number of new cases divided by the total population at risk exposed to the risk factor during the specified time breakout (120/150=80%). Q89. A public health officer is analyzing the distribution of malaria cases in a region. The disease is consistently present at a baseline, predictable level within the population year after year without external introductions. How should the occurrence of malaria in this area be classified? A) Epidemic B) Endemic C) Pandemic D) Sporadic Correct Answer: B Explanation: Endemic describes the constant, baseline, or usual presence of a disease or infectious agent within a specific geographic area or population group. Q90. In the planning of a regional safe motherhood project, the medical officer reviews interventions designed to reduce perinatal mortality. What is the definition of the perinatal mortality period according to standard public health guidelines? A) From the 28th week of gestation to the first 7 days of postnatal life B) From conception to the 28th week of gestation C) From birth up to the first 28 days of life D) From the 12th week of gestation to 1 year of age Correct Answer: A Explanation: Perinatal mortality refers to the combination of late fetal deaths (stillbirths after 28 weeks of gestation) and early neonatal deaths occurring within the first 7 days of life. 6. Mixed Clinical Syntheses & Ethics Q91. A 27-year-old male presents with a painless, indurated ulcer (chancre) on his glans penis. He reports having unprotected sexual intercourse with a new partner 3 weeks ago. Bilateral, non-tender inguinal lymphadenopathy is present. What is the definitive first-line therapeutic agent for this patient's condition? A) Oral Azithromycin 1g single dose B) Intramuscular Benzathine Penicillin G 2.4 million units single dose C) Oral Ciprofloxacin 500mg twice daily for 7 days D) Intravenous Ceftriaxone 1g daily for 10 days Correct Answer: B Explanation: A single intramuscular injection of long-acting Benzathine Penicillin G is the gold standard first-line treatment for primary, secondary, and early latent syphilis (Treponema pallidum). Q92. A 35-year-old HIV-positive patient with a CD4 count of 80 cells/µL presents with a 2-week history of progressive headache, low-grade fever, and neck stiffness. A lumbar puncture is performed. India ink preparation of the cerebrospinal fluid (CSF) reveals encapsulated budding yeast cells. What is the induction treatment of choice? A) High-dose oral Fluconazole alone B) Amphotericin B combined with Flucytosine C) Intravenous Ceftriaxone D) Intravenous Acyclovir Correct Answer: B Explanation: The standard optimal induction regimen for cryptococcal meningitis in patients with advanced HIV is a combination of intravenous Amphotericin B and oral Flucytosine for 1 to 2 weeks. Q93. A 28-year-old female presents to the outpatient clinic with a history of recurrent spontaneous abortions. She has had three consecutive first-trimester pregnancy losses. Laboratory testing reveals a prolonged activated partial thromboplastin time (aPTT) and a positive IgG anticardiolipin antibody test on two occasions 12 weeks apart. What is the most likely diagnosis? A) Systemic Lupus Erythematosus (SLE) B) Antiphospholipid Syndrome (APS) C) Immune Thrombocytopenic Purpura (ITP) D) Disseminated Intravascular Coagulation (DIC) Correct Answer: B Explanation: APS is an autoimmune hypercoagulable state characterized by clinical criteria (recurrent pregnancy loss or thrombosis) paired with persistent antiphospholipid antibodies (such as anticardiolipin). Q94. A 35-year-old male is brought to the emergency department following a building collapse. He has extensive crush injuries to both lower limbs. An electrocardiogram (ECG) shows peaked T waves, prolonged PR intervals, and widening of the QRS complexes across multiple leads. What is the most immediate life-saving medication to administer? A) Intravenous Calcium Gluconate B) Intravenous Normal Saline infusion C) Intravenous Furosemide D) Oral Sodium Polystyrene Sulfonate Correct Answer: A Explanation: Extensive crush injuries induce rhabdomyolysis and release intracellular potassium, causing severe hyperkalemia. Intravenous calcium gluconate stabilizes the cardiac myocyte membrane against depolarizing effects to prevent fatal arrhythmias. Q95. A 25-year-old male presents to the clinic with acute-onset generalized edema, hematuria, and mild hypertension. He reports having a severe skin infection (impetigo) about 2 weeks ago. Urinalysis reveals dysmorphic red blood cells and red blood cell casts. What is the underlying pathophysiological mechanism? A) Direct bacterial invasion of the renal parenchyma B) Immune-complex deposition in the glomerular basement membrane C) IgE-mediated hypersensitivity reaction D) Autoantibodies against the glomerular basement membrane Correct Answer: B Explanation: Post-streptococcal glomerulonephritis (PSGN) is a classic Type III hypersensitivity reaction. Antigen-antibody complexes deposit along the glomerular basement membrane, initiating an inflammatory response that manifests as acute nephritic syndrome. Q96. A 23-year-old female medical student presents with a history of intensive anxiety, palpitations, and panic attacks occurring prior to major oral examinations. She is physically healthy, and a thyroid panel is normal. What class of medications can be used on a short-term, situational basis to manage her peripheral autonomic symptoms during exam presentations? A) Selective Serotonin Reuptake Inhibitors (SSRIs) B) Beta-blockers (e.g., Propranolol) C) Tricyclic Antidepressants D) High-potency Antipsychotics Correct Answer: B Explanation: Non-selective beta-blockers like Propranolol attenuate peripheral sympathetic manifestations (tachycardia, tremors, sweating) associated with performance anxiety or stage fright. Q97. A 38-year-old male is diagnosed with advanced, active pulmonary multi-drug resistant tuberculosis (MDR-TB). He explicitly states that he intends to continue working as an public bus driver and refuses to take isolation precautions or comply with treatment. What ethical principle provides the justification for public health officials to enforce mandatory isolation for this patient? A) Autonomy B) Harm Principle / Protection of Public Health C) Beneficence to the individual patient D) Distributive Justice Correct Answer: B Explanation: While personal autonomy is a core principle, it can be restricted under public health law and ethics (the harm principle) when an individual's unmitigated actions pose a direct, substantial danger of transmission of a serious disease to the public. Q98. A 45-year-old female presents with chronic severe epigastric pain. An upper gastrointestinal endoscopy reveals a well-demarcated gastric ulcer. Biopsies of the gastric mucosa are positive for Helicobacter pylori colonization. What is the standard first-line eradication therapeutic strategy? A) Monotherapy with oral Omeprazole for 6 months B) Triple therapy consisting of a Proton Pump Inhibitor, Amoxicillin, and Clarithromycin C) Intravenous Ceftriaxone for 10 days D) High-dose oral Antacids combined with lifestyle advice alone Correct Answer: B Explanation: Standard H. pylori eradication uses a triple-therapy approach consisting of a PPI paired with two antibiotics (typically Amoxicillin and Clarithromycin) for 10–14 days. Q99. A 60-year-old male with long-standing Type 2 Diabetes presents with a complete loss of pain and temperature sensation in his lower extremities in a symmetrical "glove-and-stocking" distribution. He still has normal motor strength. What structural element of the nervous system is primarily affected? A) Lateral corticospinal tract fibers B) Distal symmetric peripheral unmyelinated and small myelinated nerve fibers C) Anterior horn alpha motor neurons D) Cerebellar Purkinje cells Correct Answer: B Explanation: Diabetic peripheral neuropathy commonly manifests as a length-dependent axonopathy affecting distal sensory nerves first, resulting in a stocking-glove sensory loss configuration. Q100. A 26-year-old male is brought to the emergency center with a deep stab wound to the abdomen. On examination, he has generalized abdominal guarding and hypotension. The patient is conscious but refuses to consent to an emergency exploratory laparotomy because of specific personal structural beliefs. He has been assessed by a psychiatrist and found to have full decision-making capacity. What is the most appropriate action for the managing surgeon? A) Proceed with surgery under the doctrine of emergency implied consent B) Respect the patient's competent refusal, optimize conservative medical treatment, and monitor closely C) Obtain consent from the patient's closest family member and proceed to the operating room D) Administer involuntary chemical sedation and perform the surgery to save his life Correct Answer: B Explanation: A patient who possesses full cognitive decision-making capacity has the absolute ethical and legal right to exercise autonomy and refuse any medical intervention, including life-saving surgery. Proceeding against a competent patient's refusal constitutes battery.